Nemo Drive Test on 2G/3G

Networks

Toha Ardi Nugraha Trainer at Expert Coaching Clinic

Network Optimization Process

Reason of Drive Test?

1. Network Performance Monitoring

2. Maintenance

3. Benchmarking

4. Customer Complains

Module 1 : Overview 3G System (1 hour)

Module 2 : Drive Test Concept (1,5 hour)

Module 3 : Drive Test on Field (2,5 hour)

Module 4 : Reporting (2 hour)

Module 5 : Analysis (2 hour)

OVERVIEW 3G SYSTEM

Module 1

Data Transmission

GSM & UMTS Evolution

3G/UMTS Architectures (Migration)

Specification of GSM

Frequency band :

Uplink 890 915 Mhz

Downlink 935 960 Mhz

Duplex spacing : 45 Mhz

Carrier spacing : 200 khz

Modulation : GMSK

Access method : FDMA / TDMA

3 Subsystem in GSM network

- BSS (Base Station Subsystem)

- NSS (Network and Switching Subsystem)

- OSS/OMC (Operating and Support system or

Operating and Maintenance Centre)

BSS (Base Station SubSystem)

BTS (Base Transceiver Station)

- Radio equipment

- To transmit and Receive signal to MS

- Defined a Cell coverage

depend on the power transmit

BSC (Base Station Controller)

- RRM for several BTS

- Handover management

TRAU

- Rate adaption

NSS (Network and Switching Sub System)

MSC (Mobile Switching Centre)

HLR (Home Location Register)

VLR (Visitor Location Register)

AuC (Authentication Center)

Operation and Support System

Control and Monitor the Network

- NMC (Network Management Centre)

- Some OMC are controlled by NMC

- OMC (Operation and Maintenance Centre)

GSM Frequency Bands

GSM type Frequency Band

Uplink (UL) Downlink (DL)

GSM 900 890-915 Mhz 935-960 Mhz

GSM 1800 (DCS 1800) 1710-1785 Mhz 1805-1880 Mhz

GSM 1900 (PCS 1900) 1850-1910 Mhz 1930-1990 Mhz

GSM Channelization

Physical Channel

200 Khz (Frequency Carrier) consist of 8 TS

Logical Channel

Control Channel

Traffic Channel

Control Channel

Traffic Channel

Logical channel

Chontrol Channel

Broadcast channel

Common Control Channel

Dedicated Control Channel

Traffic Channel

Full Rate Half rate

3G/UMTS Concept

WCDMA Concept

UMTS Architecture

Channelization

Handover

WCDMA - Wideband CDMA

Radio access technology for one of the UMTS access

modes (UTRA FDD) using 5 MHz duplex channels.

Frame length is of 10 msec, Chip rate is 3.84 Mcps

All users share the same frequency and time domain

Users separated by the codes